Damage Evaluation and Limit States of Rocking Concrete Walls

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14870
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 23010:Building structures and materials-related
• Research Institution: National Institute for Land and Infrastructure Management (2022); Tokyo Institute of Technology (2020-2021)
• Principal Investigator: Obara Taku 国土技術政策総合研究所, 建築研究部, 研究官 (50845451)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: RC造壁 / 機能維持 / 損傷低減 / 損傷予測数値解析モデル / アンボンドPCaPC造

Outline of Final Research Achievements

Presently, current requirements of buildings are not only to secure human lives but also to maintain continuous functionality of buildings during and after hazards. One resilient structural system may be unbonded post-tensioned precast concrete structural system. In this study, the hysteresis loops of load-drift relation of tested unbonded post-tensioned precast concrete wall with energy dissipators (the hybrid wall) was numerically simulated with an inelastic multi-spring model. Numerical analysis was also conducted to quantify the damage level and four limit states (Serviceability limit state, Reparability limit state I, Reparability limit state II and Safety limit state) of the tested hybrid wall. The numerical model was able to evaluate the timing and determining factors of each limit state. As a result, the detailed damage levels of analyzed walls were successfully classified to have a good agreement with experimental results.

Free Research Field

建築耐震工学

Academic Significance and Societal Importance of the Research Achievements

損傷制御型RC壁は，従来のRC壁より地震後も継続使用可能なことから，住機能の機能維持実現が期待できる．さらに，損傷制御型RC壁はプレキャスト工法による製作を想定していることから，工場で大量生産することで国内で社会問題となっていた職人の減少問題や工期・環境問題といった課題を十分に解決できる．
開発した数値解析ツールは，建物の機能維持・早期復旧性能を評価できる．具体的には，庁舎や学校，病院といった防災拠点施設では，地震後に継続使用可能か否かの判断が非常に重要であることから，ひび割れやコンクリートの圧壊等の損傷を予測できる解析ツールを用いれば，重要施設の高い継続使用性能の付与を達成出来る．